Lens driving module

ABSTRACT

A lens driving module for holding and moving a lens is provided, including a lens holder, a first electromagnetic driving assembly disposed on the lens holder, a base, a second electromagnetic driving assembly disposed on the base, and a first elastic member. The lens holder has an accommodating space, and the lens is disposed in the accommodating space. The second electromagnetic driving assembly is adjacent to the first electromagnetic driving assembly. The first elastic member has at least one first fixed portion and at least one moving portion. The first fixed portion is connected to the base, and the first moving portion is connected to the lens holder. The first fixed portion is disposed between the second electromagnetic driving assembly and the base.

CROSS REFERENCE TO RELATED APPLICATIONS

100011 This application is a Continuation of application Ser. No.15/913,662, filed on Mar. 6, 2018, which claims the benefit of ChinaPatent Application No. 201720327434.1, filed on Mar. 30, 2017.

BACKGROUND OF THE INVENTION Field of the Invention

The application relates in general to a lens driving module, and inparticular, to a lens driving module which used to hold and move a lens.

Description of the Related Art

As technology has advanced, a lot of electronic devices (for example,cameras and smartphones) have incorporated the functionality of takingphotographs and recording video. These electronic devices have becomemore commonplace, and have been developed to be more convenient andthin. More and more options are provided for users to choose from.

Electronic devices are becoming thinner than before, and this makes itharder to dispose current models of zoom lenses into these miniaturizedelectronic devices. Therefore, how to address the aforementioned problemhas become an important issue.

BRIEF SUMMARY OF INVENTION

To address the deficiencies of conventional products, an embodiment ofthe invention provides a lens driving module for holding and moving alens, including a lens holder, a first electromagnetic driving assemblydisposed on the lens holder, a base, a second electromagnetic drivingassembly disposed on the base, and a first elastic member. The lensholder has an accommodating space, and the lens is disposed in theaccommodating space. The second electromagnetic driving assembly isadjacent to the first electromagnetic driving assembly. The firstelastic member has at least one first fixed portion and at least onemoving portion. The first fixed portion is connected to the base, andthe first moving portion is connected to the lens holder. The firstfixed portion is disposed between the second electromagnetic drivingassembly and the base.

In some embodiments, the lens driving module has a first side and asecond side connected to the first side, and the second side is largerthan the first side.

In some embodiments, the lens driving module substantially has a cuboidstructure.

In some embodiments, the second electromagnetic driving assembly isadjacent to the first side.

In some embodiments, the first fixed portion is adjacent to the firstside.

In some embodiments, the first moving portion is adjacent to the secondside.

In some embodiments, the first elastic member further comprises a firststring portion connected to the first fixed portion and the first movingportion.

In some embodiments, the first elastic member comprises a plurality offirst elastic parts separated from each other, wherein each of the firstelastic parts comprises one first fixed portion and two first movingportions, and the first fixed portion is disposed between the firstmoving portions.

In some embodiments, the first elastic member comprises a plurality offirst elastic parts separated from each other, wherein each of the firstelastic parts comprises one first fixed portion and one first movingportion, and the first fixed portion and the first moving portion aredisposed on opposite ends of each of the first elastic parts.

In some embodiments, the first elastic member comprises a plurality offirst elastic parts separated from each other, wherein each of the firstelastic parts comprises two first fixed portions and one first movingportion, and the first moving portion is disposed between the firstfixed portions.

In some embodiments, the lens driving module further comprises a topplate and a second elastic member, the top plate is affixed relative tothe base, and the second elastic member is disposed between the topplate and the lens holder and connected to the top plate and the lensholder, wherein the lens holder is disposed between the first elasticmember and the second elastic member.

In some embodiments, the second elastic member comprises at least onesecond fixed portion and at least one second moving portion, the secondmoving fixed portion is connected to the top plate, and the secondmoving portion is connected to the lens holder, wherein the second fixedportion is disposed between the second electromagnetic driving assemblyand the top plate.

In some embodiments, the lens driving module has a first side and asecond side connected to the first side, and the second side is largerthan the first side, wherein the second fixed portion is adjacent to thefirst side.

In some embodiments, the lens driving module has a first side and asecond side connected to the first side, and the second side is largerthan the first side, wherein the second moving portion is adjacent tothe second side.

In some embodiments, the second elastic member further comprises atleast one string portion connected to the second fixed portion and thesecond moving portion.

In some embodiments, the second elastic member comprises a plurality ofsecond elastic parts separated from each other, wherein each of thesecond elastic parts comprises one second fixed portion and two secondmoving portions, and the second fixed portion is disposed between thesecond moving portions.

In some embodiments, the second elastic member comprises a plurality ofsecond elastic parts separated from each other, wherein each of thesecond elastic parts comprises one second fixed portion and one secondmoving portion, and the second fixed portion and the second movingportion are disposed on opposite ends of each of the second elasticparts.

In some embodiments, the second elastic member comprises a plurality ofsecond elastic parts separated from each other, wherein each of thesecond elastic parts comprises two second fixed portions and one secondmoving portion, and the second moving portion is disposed between thesecond fixed portions.

In some embodiments, the second elastic member comprises two secondfixed portion and one second moving portion, wherein the second movingportion has an annular structure and is disposed between the secondfixed portions.

In some embodiments, the lens driving module has two first sides onopposite sides and two second sides on opposite sides, and each of thesecond sides is greater than each of the first sides, wherein the secondfixed portions are respectively adjacent to the first sides.

BRIEF DESCRIPTION OF DRAWINGS

The invention can be more fully understood by reading the subsequentdetailed description and examples with references made to theaccompanying drawings, wherein:

FIG. 1 is a schematic diagram of an electronic device according to anembodiment of the invention;

FIG. 2 is a schematic diagram of a lens driving module according to anembodiment of the invention;

FIG. 3 is an exploded-view diagram of a lens driving module according toan embodiment of the invention;

FIG. 4 is a schematic diagram of a first elastic member according to anembodiment of the invention;

FIG. 5 is a schematic diagram of a second elastic member according to anembodiment of the invention;

FIG. 6 is a cross-sectional view along line A-A in FIG. 2;

FIG. 7 is a cross-sectional view along line B-B in FIG. 2;

FIG. 8A is a schematic diagram of a first elastic member according toanother embodiment of the invention;

FIG. 8B is a schematic diagram of a first elastic member according toanother embodiment of the invention;

FIG. 9A is a schematic diagram of a second elastic member according toanother embodiment of the invention;

FIG. 9B is a schematic diagram of a second elastic member according toanother embodiment of the invention; and

FIG. 9C is a schematic diagram of a second elastic member according toanother embodiment of the invention.

DETAILED DESCRIPTION OF INVENTION

The making and using of the embodiments of the lens driving module arediscussed in detail below. It should be appreciated, however, that theembodiments provide many applicable inventive concepts that can beembodied in a wide variety of specific contexts. The specificembodiments discussed are merely illustrative of specific ways to makeand use the embodiments, and do not limit the scope of the disclosure.

Unless defined otherwise, all technical and scientific terms used hereinhave the same meaning as commonly understood by one of ordinary skill inthe art to which this invention belongs. It should be appreciated thateach term, which is defined in a commonly used dictionary, should beinterpreted as having a meaning conforming to the relative skills andthe background or the context of the present disclosure, and should notbe interpreted in an idealized or overly formal manner unless definedotherwise.

Referring to FIG. 1, in an embodiment of the invention, the lens drivingmodule 10 can be disposed in an electronic device 20 and used to holdand drive a lens 30, so that the lens 30 can move relative to an imagesensor in the electronic device 20, and the purpose of focus adjustmentcan be achieved. For example, the electronic device 20 can be a digitalcamera or a smart phone having the function of capturing photographs ormaking video recordings.

FIG. 2 is a schematic diagram of the lens driving module 10, and FIG. 3is an exploded-view diagram thereof. As shown in FIGS. 2 and 3, the lensdriving module 10 primarily comprises an upper housing 100, a lensholder 200, at least one first electromagnetic driving assembly 300, atleast one second electromagnetic driving assembly 400, a base 500, afirst elastic member E1, and a second elastic member E2. The upperhousing 100 comprises a top plate 110 and four lateral walls 120connected to the top plate 110, such that the upper housing 100 and thebase 500 can be assembled and form a hollow box. The lens holder 200,the first electromagnetic driving assembly 300, the secondelectromagnetic driving assembly 400, the first elastic member E1, andthe second elastic member E2 can be disposed in the hollow box.

The lens driving module 10 substantially has a cuboid structure. Thelength of a first side 11 of the lens driving module 10 is less thanthat of a second side 12 of the lens driving module 10.

The lens holder 200 has an accommodating space 210 and a concavestructure 220, wherein the accommodating space 210 is formed at thecenter of the lens holder 200, and the concave structure 220 is formedon the outer wall of the lens holder 200 and surrounds the accommodatingspace 210. The lens 30 shown in FIG. 1 can be affixed to the lens holder200 and accommodated in the accommodating space 210. The upper housing100 and the base 500 respectively have an opening O1 and an opening O2,and both the openings O1 and O2 correspond to the accommodating space210. The image sensor (not shown) in the electronic device 20 is usuallydisposed under the base 500 and affixed relative to the base 500.Therefore, external light can reach the image sensor through the openingO1, the lens 30, and the opening O2 in sequence, so as to form an imageon the image sensor.

The first electromagnetic driving assembly 300 is disposed in theconcave structure 220 of the lens holder 200, and the secondelectromagnetic driving assembly 400 is disposed on the base 500 andadjacent to the first electromagnetic driving assembly 300. The lensholder 200 can be driven to move relative to the base 500 along theZ-axis by the electromagnetic effect between the first electromagneticdriving assembly 300 and the second electromagnetic driving assembly400.

For example, in this embodiment, the first electromagnetic drivingassembly 300 is a driving coil surrounding the accommodating space 210of the lens holder 200, and the second electromagnetic driving assembly400 comprises two magnets, wherein the driving coil is disposed betweentwo magnets.

When a current flows through the driving coil (the first electromagneticdriving assembly 300), the electromagnetic effect is generated betweenthe driving coil and the magnets. Thus, the lens holder 200 and the lens30 disposed thereon can be driven to move upwardly or downwardlyrelative to the base 500 and the image sensor along the Z-axis, and thepurpose of focus adjustment can be achieved.

In some embodiments, the first electromagnetic driving assembly 300 canbe a magnet, and the second electromagnetic driving assembly 400 can bea driving coil.

Referring to FIGS. 3 and 4, in this embodiment, the first elastic memberE1 comprises a plurality of first elastic parts E10. Each of the firstelastic parts E10 comprises one first fixed portion E11, two firstmoving portions E12, and a plurality of first string portions E13connected to the first fixed portion E11 and the first moving portionsE12.

Two first moving portions E12 are respectively disposed on opposite endsof the first elastic part E10, and the first fixed portion E11 isdisposed between two first moving portions E12. The first fixed portionE11 is affixed to the base 500 by sticking or using a locking member(for example, by using a screw), and the first moving portions E12 areaffixed to the lens holder 200 by sticking or using a locking member(for example, by using a screw).

The surface area of the first fixed portion E11 and the first movingportion E12 is greater than that of the first string portion E13,therefore, the sticking area of the first fixed portion E11 and thefirst moving portion E12 can be increased, or more locking members canbe disposed. The loosen of the first fixed portion E11 and the firstmoving portion E12 due to the movement of the lens holder 200 relativeto the base 500 can be avoided.

As shown in FIGS. 3 and 5, in this embodiment, the second elastic memberE2 comprises two second fixed portions E21, one second moving portionE22, and a plurality of second string portions E23 connected to thesecond fixed portions E21 and the second moving portion E22. The secondmoving portion E22 has an annular structure and disposed between twosecond fixed portions E21.

Similar to the first elastic member E1, the second fixed portions E21 ofthe second elastic member E2 are affixed to the top plate 110 of theupper housing 100 by sticking or using a locking member (for example, byusing a screw), and the second moving portion E22 is affixed to the lensholder 200 by sticking.

As shown in FIG. 3, the lens holder 200 is disposed between the firstelastic member E1 and the second elastic member E2, and can be hung inthe box formed by the upper housing 100 and the base 500 by the firstelastic member E1 and the second elastic member E2. Moreover, when thelens holder 200 moves relative to the base 500, the first elastic memberE1 and the second elastic member E2 are deformed and provides elasticforce, and the range of motion of the lens holder 200 in the directionof the Z-axis can be restricted.

FIG. 6 is a cross-sectional view of the lens driving module 10 shown inFIG. 2 along line A-A. As shown in FIG. 6, when the first fixed portionE11 of the first elastic member E1 and the second electromagneticdriving assembly 400 are affixed to the base 500, the first fixedportion E11 and the second electromagnetic driving assembly 400 areadjacent to the first side 11 of the lens driving module 10, and thefirst fixed portion E11 is disposed between the second electromagneticdriving assembly 400 and the base 500. Similarly, when the second fixedportions E21 of the second elastic member E2 are affixed to the topplate 110 of the upper housing 100, two second fixed portions E21 arerespectively adjacent to the opposite first sides 11 of the lens drivingmodule 10, and disposed between the second electromagnetic drivingassembly 400 and the top plate 110.

Therefore, the whole volume of the lens driving module 10 can bereduced, such that the lens driving module 10 can be disposed in theminiaturized electronic device 20.

FIG. 7 is a cross-sectional view of the lens driving module 10 shown inFIG. 2 along line B-B. As shown in FIG. 7, when the first moving portionE12 of the first elastic member E1 is affixed to the lens holder 200,the first moving portion E12 is adjacent to the second side 12 of thelens driving module 10.

Since the first moving portion E12 and the first string portion E13connected to the first fixed portion E12 and the first moving portionE12 are not covered by the second electromagnetic driving assembly 400in the direction of the Z-axis, the second elastic member E2 does notcontact the second electromagnetic driving assembly 400 when the lensholder 200 moves upwardly along the Z-axis, and the movement of the lensholder 200 is not disturbed.

The appearance and the structure of the first elastic member E1 of thelens driving module 10 can be adjusted as required. For example, asshown in FIG. 8A, in another embodiment, the first elastic member E1comprises a plurality of first elastic parts E10, and each of the firstelastic parts E10 comprises one first fixed portion E11, one firstmoving portion E12, and a plurality of first string portions E13connected to the first fixed portion E11 and the first moving portionE12. The first fixed portion E11 and the first moving portion E12 arerespectively disposed on opposite ends of the first elastic part E10.

As shown in FIG. 8B, in another embodiment, the first elastic member E1comprises a plurality of first elastic parts E10, and each of the firstelastic parts E10 comprises two first fixed portions E11, one firstmoving portion E12, and a plurality of first string portions E13connected to the first fixed portions E11 and the first moving portionE12. Two first fixed portions E11 are respectively disposed on oppositeends of the first elastic part E10, and the first moving portion E12 isdisposed between two first fixed portions E11.

It should be noted that, when the first elastic member E1 in FIG. 8A orFIG. 8B is used in the lens driving module 10, the first fixed portionE11 and the first moving portion E12 are also adjacent to the first side11 and the second side 12 of the lens driving module 10 respectively,and the first fixed portion E11 is also disposed between the secondelectromagnetic driving assembly 400 and the base 500. Therefore, thelens driving module 10 can be reduced and the movement of the lensholder 200 is not disturbed.

In some embodiments, the appearance and the structure of the secondelastic member E2 are similar to that of the first elastic member E1. Asshown in FIG. 9A, in another embodiment, the second elastic member E2comprises a plurality of second elastic parts E20, and each of thesecond elastic parts E20 comprises one second fixed portion E21, twosecond moving portion E22, and a plurality of second string portion E23connected to the second fixed portion E21 and the second moving portionE23. Two second moving portion E22 are respectively disposed on oppositeends of the second elastic part E20, and the second fixed portion E21 isdisposed between two second moving portions E22.

As shown in FIG. 9B, in another embodiment, the second elastic member E2comprises a plurality of second elastic parts E20, and each of thesecond elastic parts E20 comprises one second fixed portion E21, onesecond moving portion E22, and a plurality of second string portions E23connected to the second fixed portion E21 and the second moving portionE22. The second fixed portion E21 and the second moving portion E22 arerespectively disposed on opposite ends of the second elastic part E20.

As shown in FIG. 9C, in another embodiment, the second elastic member E2comprises a plurality of second elastic parts E20, and each of thesecond elastic parts E20 comprises two second fixed portions E21, onesecond moving portion E22, and a plurality of second string portions E23connected to the second fixed portions E21 and the second moving portionE22. Two second fixed portions E21 are respectively disposed on oppositeends of the second elastic part E20, and the second moving portion E22is disposed between two second fixed portions E21.

When the second elastic member E2 in FIG. 9A, FIG. 9B or FIG. 9C is usedin the lens driving module 10, the second fixed portion E21 and thesecond moving portion E22 are respectively adjacent to the first side 11and the second side 12 of the lens driving module 10, and the secondfixed portion E21 is disposed between the second electromagnetic drivingassembly 400 and the top plate 110 of the upper housing 100. Therefore,contact between the second elastic member E2 and the secondelectromagnetic driving assembly 400 when the lens holder 200 movestoward the base 500 along the Z-axis can be prevented, and the movementof the lens holder 200 is not disturbed.

In summary, a lens driving module is provided. Since the first fixedportion of the first elastic affixed member affixed to the base isdisposed between the second electromagnetic driving assembly and thebase, and the second fixed portion of the second elastic member affixedto the top plate is disposed between the second electromagnetic drivingassembly and the top plate, the volume of the lens driving module can bereduced, and the lens driving module can be disposed in the miniaturizedelectronic device. Moreover, since the first fixed portion and the firstmoving portion (or the second fixed portion and the second movingportion) are respectively disposed on the different sides of the lensdriving module, contact between the first elastic member and the secondelectromagnetic driving assembly and contact between the second elasticmember and the second electromagnetic driving assembly can be prevented.

Although some embodiments of the present disclosure and their advantageshave been described in detail, it should be understood that variouschanges, substitutions and alterations can be made herein withoutdeparting from the spirit and scope of the disclosure as defined by theappended claims. For example, it will be readily understood by thoseskilled in the art that many of the features, functions, processes, andmaterials described herein may be varied while remaining within thescope of the present disclosure. Moreover, the scope of the presentapplication is not intended to be limited to the particular embodimentsof the process, machine, manufacture, compositions of matter, means,methods and steps described in the specification. As one of ordinaryskill in the art will readily appreciate from the disclosure of thepresent disclosure, processes, machines, manufacture, compositions ofmatter, means, methods, or steps, presently existing or later to bedeveloped, that perform substantially the same function or achievesubstantially the same result as the corresponding embodiments describedherein may be utilized according to the present disclosure. Accordingly,the appended claims are intended to include within their scope suchprocesses, machines, manufacture, compositions of matter, means,methods, or steps. Moreover, the scope of the appended claims should beaccorded the broadest interpretation so as to encompass all suchmodifications and similar arrangements.

While the invention has been described by way of example and in terms ofpreferred embodiment, it is to be understood that the invention is notlimited thereto. On the contrary, it is intended to cover variousmodifications and similar arrangements (as would be apparent to thoseskilled in the art). Therefore, the scope of the appended claims shouldbe accorded the broadest interpretation to encompass all suchmodifications and similar arrangements.

What is claimed is:
 1. An optical member driving mechanism, comprising:a fixed part; a movable part, configured to accommodate an opticalmember having an optical axis, wherein the movable part is movablerelative to the fixed part; a driving assembly, configured to drive themovable part to move relative to the fixed part; and an elasticassembly, elastically connected to the movable part and the fixed part;wherein the elastic assembly overlaps the driving assembly as seen fromthe optical axis.
 2. The optical member driving mechanism as claimed inclaim 1, wherein the driving assembly comprises a driving coil and adriving magnetic member, and the length of the driving coil extendingalong the optical axis is less than the length of the driving magneticmember extending along the optical axis.
 3. The optical member drivingmechanism as claimed in claim 2, wherein the fixed part comprises ahousing and a base fixedly connected to the housing, and the elasticassembly comprises a first elastic member elastically connected to themovable part and the base, wherein the first elastic member has aplurality of first fixed part connecting portions and a first movablepart connecting portion, and the first movable part connecting portionis disposed between the first fixed part connecting portions.
 4. Theoptical member driving mechanism as claimed in claim 3, wherein theoptical member driving mechanism has a rectangular structure as seenfrom the optical axis, and comprises a first side and a second side,wherein the first fixed part connecting portions are adjacent to thefirst side, and the first movable part connecting portion is adjacent tothe second side.
 5. The optical member driving mechanism as claimed inclaim 4, wherein the length of the first side is less than the length ofthe second side.
 6. The optical member driving mechanism as claimed inclaim 3, wherein the elastic assembly comprises two first elasticmembers separated from each other, and the driving magnetic member has alongitudinal axis, wherein as seen from a direction perpendicular to theoptical axis and the longitudinal axis, the two first elastic members donot overlap.
 7. The optical member driving mechanism as claimed in claim6, wherein the optical member driving mechanism further comprises avirtual line overlapping the optical axis and extending along thedirection, and the two first elastic members are disposed on oppositesides of the virtual line.
 8. The optical member driving mechanism asclaimed in claim 7, wherein as seen from the optical axis, the two firstelastic members do not overlaps the virtual line.
 9. The optical memberdriving mechanism as claimed in claim 3, wherein the movable part has anaccommodating space configured to accommodate the optical member, thebase has an opening, and the optical axis passes through the opening,where as seen from the optical axis, the greatest diameter of theaccommodating space is smaller than the greatest diameter of theopening.
 10. The optical member driving mechanism as claimed in claim 2,wherein the elastic assembly comprises two first elastic membersseparated from each other, and the driving magnetic member has alongitudinal axis, wherein as seen from the longitudinal axis, the twofirst elastic members do not overlap.
 11. The optical member drivingmechanism as claimed in claim 10, wherein the optical member drivingmechanism further comprises a virtual line overlapping the optical axisand extending along the longitudinal axis, and the two first elasticmembers are disposed on opposite sides of the virtual line.
 12. Theoptical member driving mechanism as claimed in claim 11, wherein as seenfrom the optical axis, the two first elastic members do not overlaps thevirtual line.
 13. The optical member driving mechanism as claimed inclaim 1, wherein the fixed part comprises a housing, and a portion ofthe driving assembly is disposed on the housing, wherein the elasticassembly overlaps the portion of the driving assembly as seen from theoptical axis.
 14. The optical member driving mechanism as claimed inclaim 13, wherein the driving assembly comprises a driving magneticmember disposed on the housing, and the elastic assembly comprises asecond elastic member elastically connected to the housing and themovable part, wherein the second elastic member overlaps the drivingmagnetic member as seen from the optical axis.
 15. The optical memberdriving mechanism as claimed in claim 14, wherein the second elasticmember has a plurality of second fixed part connecting portions and asecond movable part connecting portion, and the second movable partconnecting portion is disposed between the second fixed part connectingportions.
 16. The optical member driving mechanism as claimed in claim15, wherein the optical member driving mechanism has a rectangularstructure as seen from the optical axis, and comprises a first side anda second side, wherein the second fixed part connecting portions areadjacent to the first side, and the second movable part connectingportion is adjacent to the second side
 17. The optical member drivingmechanism as claimed in claim 16, wherein the length of the first sideis less than the length of the second side.
 18. The optical memberdriving mechanism as claimed in claim 1, wherein the driving assemblycomprises a driving magnetic member, and the elastic assembly comprisesa first elastic member elastically connected to the movable part and thefixed part, wherein the first elastic member has at least one firstfixed part connecting portion, and the first fixed part connectingportion overlaps the driving magnetic member as seen from the opticalaxis.
 19. The optical member driving mechanism as claimed in claim 18,wherein the first fixed part connecting portion and the driving magneticmember are separated as seen from the longitudinal axis of the drivingmagnetic member.
 20. The optical member driving mechanism as claimed inclaim 1, wherein the driving assembly comprises a driving coil, and aportion of the fixed part is disposed between the movable part and thedriving coil.